Least-mean-square-adaptive-algorithm-based active absorption method of wave maker

Abstract

The invention discloses a least-mean-square-adaptive-algorithm-based active absorption method of a wave maker. The method comprises: S1, establishing a two-dimensional model of a push-plate active absorption type wave maker and calculating a front wave elevation of the wave-making plate; S2, deducing an absorption transfer function F of the push-plate active absorption type wave maker; S3, on thebasis of a least-mean-square adaptive filter, carrying out fitting of the absorption transfer function F in the S2; and S4, erecting a verification model by using a Simulink simulation tool to check effectiveness of method utilization in the S3; to be specific, constructing an active absorption module in the verification model by using an LMS algorithm to absorb a secondary reflected wave and comparing the model with the module without absorption to check the effect of secondary reflected wave absorption by adding the LMS algorithm.

Description

technical field [0001] The invention relates to the field of marine engineering, in particular to an active absorption method for wave generators based on the least mean square adaptive algorithm. Background technique [0002] In the engineering fields such as marine and shipbuilding, wave generators are often used in the laboratory to simulate sea waves, act on the model, and verify various indicators of engineering design. However, the incident wave generated by the wave machine is reflected after encountering the model, and the reflected wave is reflected again after encountering the wave-making plate to generate a secondary reflected wave, which acts on the experimental model together with the original incident wave. After multiple reflections, the target domain will generate error. Passive wave-absorbing devices are mostly used now, such as setting wave-absorbing beaches and other devices on the pool wall, but this cannot fundamentally solve the problem. Therefore, th...

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Problems solved by technology

However, the least squares criterion is prone to homogenization errors, and it is impossible to obtain an approximation result with a small error within the wave frequency range (0-2Hz).

There are still shortcomings in the research on filters with good absorption effects in the local frequency domain, and this research needs to be improved

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